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Floating plant for high light tank to help reduce algae?

I sold the 110g tall a long time ago and put the light on my 30g planted cherry shrimp tank but only have 2 of the lights turned on and for only 7 hours a day.

I'm getting some algae issues obviously as 130w/30g=4.33w/g which is considered high. a tiny amount of Black brush, some green spot on the glass, some green hair, brown/blackish film on leaves.....all in all not the best looking.

I have no fish, don't do any ferts, no c02 and have no time or will to get back into all that.... I also don't really want to spend the money on a new light more suited for my tank so.....

I was thinking maybe there's a high light floating plant that might help shade out some of the excess light?

Salvinia is a great nutrient sponge. I have it in my tropical tank. Have to thin is about once a month... Takes is about that long to cover the whole surface of the 2ft wide tank. Much neater plant than most floaters. Doesn't have ridiculously long roots and it very easy to remove.